C.6.18.4 Fire

To convert the old fire particle system to new particles you
can use an emitter which is oriented at the bottom of the flame.
To get behaviour equivalent to the old system use a box-shaped emitter, either
with the metrics specified by ‘originbox’ or a very small box
around ‘origin’.
You can use a force effector with random acceleration to have the particles
shift a bit. Here you see an example of a fire particle system in the
world file: